Photoluminescence, radioluminescence and thermoluminescence properties of Eu3+ doped cadmium tantalate phosphor

Abstract

For investigate spectroscopic properties, Eu³⁺ doped columbite type CdTa₂O₆ phosphors were synthesized using the solid state reaction method. The synthesized ceramic phosphors were investigated by X-ray diffraction (XRD), scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), photoluminescence (PL), radioluminescence (RL) and thermoluminescence (TL) analyses. CdTa₂O₆:Eu³⁺ phosphors exhibited emissions at 591.8 nm and 612.1 nm because of the characteristic band transitions of the Eu³⁺ ion. Phosphor emission increased with increasing Eu³⁺ ion dopant up to 1.5 mol%, and then decreased owing to concentration quenching. The decay times decreased with increasing Eu³⁺ dopant, while they were varied from 711 to 534 μm. The scintillation emissions of Eu³⁺ doped samples from the UV to near-IR spectral region were monitored by RL measurements. The high RL emission may be attributed to the good scintillation property of phosphor. TL glow curves were monitored for different Eu³⁺ concentrations in the range of 50 °C to 400 °C at a heating rate of 2 °C s⁻¹, after being irradiated under short-wave UV light (254 nm).